西咪替丁調(diào)控免疫反應(yīng)的研究
[Abstract]:The regulation of immunity is critical to the immune response of the host. Regulatory T cell, called Treg cell, is mainly involved in peripheral immune tolerance and negative regulation of immune response to prevent over-immune response and autoimmune damage to the host itself. Cimetidine (CIM) is a histamine H2 receptor antagonist, initially found to be able to reduce gastric acid secretion and digestive tract infection. In recent years, it has been found that there are a variety of regulatory effects on the immune response. It has been found in this laboratory that CIM can promote the adaptive immune response as a vaccine adjuvant, thus enhancing the immune effect of the vaccine, and further shows that it may have an inhibitory effect on the regulatory T cell function. However, the molecular mechanism of this regulation of CIM is not very clear. In the first part of this study, the effects of CIM on regulatory T cells in vitro were studied, and the second part was to investigate the effects of CIM on inflammatory response in vitro. In vitro, the expression and stability of the transcription factor Foxp3 of CD4 + CD25 + hTreg cells and Jurkat T cells stimulated by CIM in vitro were studied. The effect of CIM on Stubl activation was further analyzed by silencing E3 ubiquitin ligase Stub1. The results show that CIM can activate Stubl and induce ubiquitination degradation of Foxp3, thus demonstrating that the function of CIM on Foxp3 is mainly achieved by degrading the protein activity of Foxp3. The upstream PI3K-Akt-mTOR signaling pathway is the main pathway for CIM, and the degradation of the CIM to Foxp3 is dependent on the activation of the PI3K-Akt-mTOR signaling pathway by using the inhibitor LY294002 to close the PI3K-Akt-mTOR signaling pathway. Thus, CIM can promote the degradation of Foxp3 mediated by E3 ubiquitin ligase Stubl by activating the T-Akt-mTOR signaling pathway, thus reducing the immunosuppressive function of Treg cells, which can promote adaptive immune response to a certain extent. In the second part, inflammatory bowel disease (IBD) is a kind of intestinal disease caused by intestinal microorganism pathogenic bacteria and inflammatory response. The cause of the disease is complicated, it is easy to repeat, and the long-term illness is easy to be converted into colorectal cancer. It has been shown that CIM has therapeutic effect on the digestive tract and digestive tract, and can reduce the generation of some inflammatory factors in the innate immune response. In the process of using TNBS to induce inflammatory bowel inflammation, it was found that the injection of CIM could effectively reduce the symptoms of IBD in mice and protect the mice from the death caused by IBD. The results of immunohistochemistry show that macrophages play an important role in inflammatory response in the early stage of IBD model, the number of infiltration and the expression of TNF-CoV and other relevant inflammatory molecules can be effectively inhibited by CIM. Further use of mouse primary bone marrow-derived macrophages (BMDM) demonstrated that CIM significantly reduced the transcription of TNF-a, IL-6, IL-1, etc. associated with LPS-activated BMDM, and reduced TNF-alpha levels. The results of Western blot analysis showed that CIM could inhibit the expression of the related inflammatory factor gene by inhibiting the NF-Sepharose B pathway stimulated by the stimulation signal. Through cell adoptive transfer assay and fluorescence quantitative PCR analysis, it is shown that CIM may have a certain inhibitory effect on the migration of macrophages to inflammatory sites. The results of our study indicate that CIM can reduce the immunosuppressive function of Treg cells in adaptive immune response; in inflammatory response, CIM can reduce the expression of relevant inflammatory factors by inhibiting the activation of NF-Sepharose B signaling pathway at the beginning of the innate immune response. thereby protecting the mice from death caused by excessive inflammatory reactions.
【學(xué)位授予單位】:中國(guó)農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:R392
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